Artículo de revista
Pilot observations for MALT-45: a Galactic plane survey at 7 mm
Fecha
2013Registro en:
MNRAS 429, 469–481 (2013)
doi:10.1093/mnras/sts350
Autor
Jordan, C. H.
Walsh, A. J.
Lowe, V.
Lo, N.
Purcell, C. R.
Voronkov, M. A.
Longmore, S. N.
Institución
Resumen
We introduce the Millimetre Astronomer’s Legacy Team – 45 GHz (MALT-45) Galactic plane
survey and describe pilot survey results with the Australia Telescope Compact Array (ATCA).
The pilot survey was conducted to test the instrumentation and observational technique of
MALT-45, before commencing the full survey. We mapped two half-square degree regions
within the southern Galactic plane around the G333 giant molecular cloud, using fast mosaic
mapping. Using the new Compact Array Broad-band Backend on the ATCA, we were able to
observe two 2048MHzspectral windows, centred on frequencies 43.2 and 48.2 GHz. Although
only a coarse spectral resolution of around 7 km s−1 was available to us, we detect widespread,
extended emission in the CS (1–0) ground state transition.We also detect eight Class I CH3OH
masers at 44 GHz and three SiO masers in vibrationally excited (1–0) transitions. We also
detect the H53α radio recombination line, non-vibrationally excited SiO (1–0) and emission
in the CH3OH 11–00 A+ line.